<!-- city list -->
<template>
  <div class="list" ref='wrapper'>
      <div>
        <div class="area">
            <div class="title border-top-bottom">当前城市</div>
            <div class="buttom-list">
                <div class="button-wrapper">
                    <div class="button">{{this.currentCity}}</div>
                </div>
            </div>
        </div>
        <div class="area">
            <div class="title border-top-bottom">热门城市</div>
            <div class="buttom-list">
                <div class="button-wrapper" v-for="item in hotCities" :key="item.id">
                    <div class="button" @click="handleCityChange(item.name)">{{item.name}}</div>
                </div>
            </div>
        </div>
        <div class="area" v-for="(val,key) in cities" :key="key" :ref="key">
            <div class="title border-top-bottom">{{key}}</div>
            <div class="item-list" v-for="item in val" :key="item.id">
                <div class="item border-bottom" @click="handleCityChange(item.name)">{{item.name}}</div>
            </div>
        </div>
       </div>
  </div>
</template>

<script>
import Bscroll from 'better-scroll'
import {mapState, mapMutations} from 'vuex'
export default {
  data () {
    return {
    }
  },

  props: {
    cities: Object,
    hotCities: Array,
    letter: String
  },

  components: {},

  mounted () {
    this.scroll = new Bscroll(this.$refs.wrapper)
    // this.$nextTick(() => {
    //   this.scroll = new Bscroll(this.$refs.wrapper, {})
    // })
  },
  computed: {
    ...mapState({currentCity: 'city'})
  },

  methods: {
    handleCityChange (city) {
      this.changeCity(city)
      this.$router.push('/')
    },
    ...mapMutations(['changeCity'])
  },

  watch: {
    letter () {
      if (this.letter) {
        var element = this.$refs[this.letter][0]
        // console.log(element)
        this.scroll.scrollToElement(element) // scrollToElement(el, time, offsetX, offsetY, easing) el选项可以是选择器或者元素
      }
    }
  }
}

</script>
<style lang='stylus' scoped>
@import '~styles/varibles.styl'
.border-top-bottom
  &:before
    border-color #ccc
  &:after
    border-color #ccc
.border-bottom
  &:before
    border-color #ccc
.list
    overflow hidden
    position absolute
    top 1.58rem
    left 0
    right 0
    bottom 0
    .title
        line-height .4rem
        background-color #eee
        padding-left .2rem
        color #666
        font-size .26rem
    .buttom-list
        padding .1rem .6rem .1rem .1rem
        overflow hidden
        .button-wrapper
            width 33.33%
            float left
            .button
                padding .1rem 0
                text-align center
                margin .1rem
                border .02rem solid #ccc
                border-radius .06rem
    .item-list
        .item
            line-height .76rem
            padding-left .2rem
</style>
